[eluser]InsiteFX[/eluser]
You do not need the top stuff, CodeIgniter now has an .htaccess file in the directories.
Code:
#Checks to see if the user is attempting to access a valid file,
#such as an image or css document, if this isn't true it sends the
#request to index.php
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L]